Bernal-stacked bilayer graphene modulated by a superlattice potential is a highly tunable system predicted to realize isolated topological flat bands. In this work we calculate the band structure and quantum geometry of bilayer graphene subject to both triangular and square superlattices, across a wide range of gate voltages. We identify the parameter regime that optimizes the "single-particle indicators" for the stability of a fractional Chern insulator (FCI) when a topological flat band is partially filled. Our results guide the experimental realization of an FCI in this platform.
@article{arxiv.2505.05551,
title = {Optimizing superlattice bilayer graphene for a fractional Chern insulator},
author = {Dathan Ault-McCoy and M. Nabil Y. Lhachemi and Aaron Dunbrack and Sayed Ali Akbar Ghorashi and Jennifer Cano},
journal= {arXiv preprint arXiv:2505.05551},
year = {2025}
}